@book {Bi,
 AUTHOR = {Birman, Joan S.},
 TITLE = {Braids, links, and mapping class groups},
 series = {Annals of Mathematics Studies},
 number ={82},
 PUBLISHER = {Princeton University Press},
 ADDRESS = {Princeton, N.J.},
 YEAR = {1974},
 PAGES = {ix+228},
 MRCLASS = {55A25},
 MRNUMBER = {51 \#11477},
 MRREVIEWER = {Wilbur Whitten},
}
@article {BH,
 AUTHOR = {Birman, Joan S. and Hilden, Hugh M.},
 TITLE = {Heegaard splittings of branched coverings of ${S}\sp{3}$},
 JOURNAL = {Trans. Amer. Math. Soc.},
 VOLUME = {213},
 YEAR = {1975},
 PAGES = {315--352},
 MRCLASS = {55A10},
 MRNUMBER = {52 \#1662},
 MRREVIEWER = {Wilbur Whitten},
}
@article {MM,
 AUTHOR = {Mayberry, John P. and Murasugi, Kunio},
 TITLE = {Torsion-groups of abelian coverings of links},
 JOURNAL = {Trans. Amer. Math. Soc.},
 FJOURNAL = {Transactions of the American Mathematical Society},
 VOLUME = {271},
 YEAR = {1982},
 NUMBER = {1},
 PAGES = {143--173},
 ISSN = {0002-9947},
 CODEN = {TAMTAM},
 MRCLASS = {57M25 (57M12)},
 MRNUMBER = {84d:57004},
 MRREVIEWER = {W. D. Neumann},
}
@book {MB,
 TITLE = {The {S}mith conjecture},
 EDITOR = {Morgan, John W. and Bass, Hyman},
 NOTE = {Papers presented at the symposium held at Columbia University,
 New York, 1979},
 PUBLISHER = {Academic Press Inc.},
 ADDRESS = {Orlando, FL},
 YEAR = {1984},
 PAGES = {xv+243},
 ISBN = {0-12-506980-4},
 MRCLASS = {57-06 (57N10 57S17 57S25)},
 MRNUMBER = {86i:57002},
 MRREVIEWER = {Allan Edmonds},
}
@article {M,
 AUTHOR = {Mulazzani, Michele},
 TITLE = {On $p$-symmetric {H}eegaard splittings},
 JOURNAL = {J. Knot Theory Ramifications},
 FJOURNAL = {Journal of Knot Theory and its Ramifications},
 VOLUME = {9},
 YEAR = {2000},
 NUMBER = {8},
 PAGES = {1059--1067},
 ISSN = {0218-2165},
 MRCLASS = {57N10 (57M10 57M25 57R65)},
 MRNUMBER = {2002a:57027},
 MRREVIEWER = {Tsuyoshi Kobayashi},
}
@article {MS,
 AUTHOR = {Morimoto, Kanji and Sakuma, Makoto},
 TITLE = {On unknotting tunnels for knots},
 JOURNAL = {Math. Ann.},
 FJOURNAL = {Mathematische Annalen},
 VOLUME = {289},
 YEAR = {1991},
 NUMBER = {1},
 PAGES = {143--167},
 ISSN = {0025-5831},
 CODEN = {MAANA},
 MRCLASS = {57M25 (57M15)},
 MRNUMBER = {92e:57015},
 MRREVIEWER = {Martin Scharlemann},
}
@article {Vi,
 AUTHOR = {Viro, O. Ja.},
 TITLE = {Links, two-sheeted branching coverings and braids},
 JOURNAL = {Mat. Sb. (N.S.)},
 VOLUME = {87(129)},
 YEAR = {1972},
 PAGES = {216--228},
 MRCLASS = {55A25 (57C45)},
 MRNUMBER = {45 \#7701},
 MRREVIEWER = {O. Krotenheerdt},
 note={English translation in Math. USSR-Sb. 16 (1972), 223--236},
}